EGR Valve Insufficient Air flow 1997 A4 quattro
12-29-2008, 05:46 PM
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EGR Valve Insufficient Air flow 1997 A4 quattro
I really do not know what to do at this time. The Check Engine light has been on since two years now.
I have changed the EGR Valve $$$, changed the electrical part $$$ genuine (Audi parts) where the EGR vacuums connect, but still the check Engine light keeps coming on after 3 weeks of driving with Insufficient Air Flow error code.
What next now, Any one please direct me on how to diagnose and fix this problem on my A4 quattro
I have changed the EGR Valve $$$, changed the electrical part $$$ genuine (Audi parts) where the EGR vacuums connect, but still the check Engine light keeps coming on after 3 weeks of driving with Insufficient Air Flow error code.
What next now, Any one please direct me on how to diagnose and fix this problem on my A4 quattro
12-29-2008, 07:23 PM
#3
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About 3 hours work and $30 of parts.
<center><img src="http://pictureposter.audiworld.com/37725/egr_valve.jpg"></center><p>If a shop charged you for that work they ripped you off. The EGR valve rarely fails.
Like 4Driver4 said you have a blocked EGR passage. Very common on the 12 valve V6.
The passage allows exhaust gases to be injected back into the intake manifold. Unfortunately as the engines get older blow by gases condense in the passage between the EGR valve and the throttle body. This blocks up after a while. Once that happens the EGR temp sensor doesn't see the requested increase in intake temp when the EGR valve cycles and trips the CEL
There's a possibility that a shop will try to turn this into a 6 hour job as they will need to remove the intake manifold. This is not necessary . You need gaskets 20 and 15 in the picture and a couple of cans of gumout.
I have done this twice as my A4 had 168K when I sold it.
Like 4Driver4 said you have a blocked EGR passage. Very common on the 12 valve V6.
The passage allows exhaust gases to be injected back into the intake manifold. Unfortunately as the engines get older blow by gases condense in the passage between the EGR valve and the throttle body. This blocks up after a while. Once that happens the EGR temp sensor doesn't see the requested increase in intake temp when the EGR valve cycles and trips the CEL
There's a possibility that a shop will try to turn this into a 6 hour job as they will need to remove the intake manifold. This is not necessary . You need gaskets 20 and 15 in the picture and a couple of cans of gumout.
I have done this twice as my A4 had 168K when I sold it.
12-30-2008, 07:22 AM
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I've had to do this twice so far
Be prepared to sit on top of the engine! I used a piece of wire rope with the end splayed and mounted in an electric drill (rotating in the direction to wind up the wire) to ream the hole out. Finish of with chemicals to remove all traces of carbon. If you don't do a good job, it won't be long before you will have to do it again (ask me how I know)!
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03-13-2011, 07:53 PM
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audi calls for premium fuel, does using regular fuel cause this egr congestion. i have codes p0402 and p0306 and thinking this is because of the inexpensive fuel/low quality.
03-14-2011, 06:26 AM
#10
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P0402 is caused by blow by gases condensing in the intake tract.
P0306 is cylinder 6 misfire , probably spark plug, wire or coil.